ORGANS OF THE IMMUNE SYSTEM

Table of contents :


  • primary or central lymphoid tissues
  • secondary or peripheral lymphoid tissues
  • tertiary extralymphoid tissue

  • lymphoid system : the lymphoid tissue of the body considered collectively

    It can be divided into : Lymphocyte traffic between lymphoid tissues ensures that : "Lymphocyte trapping" concentrates recirculating lymphocytes in regional lymph nodes where Ag has localized, thereby depleting Ag-reactive lymphocytes from the circulating pool. This phenomenon is mediated by the Ag-induced release of T cell cytokines and occurs within 24 hours of antigen localization. Several days later activated blast cells are released into the thoracic duct.

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